JPS61109177A - Writing type data input device - Google Patents

Abstract

PURPOSE:To facilitate the incorporation of a sensor and also to prevent the breakage of the sensor due to impact, by attaching the sensor to an elastic member of two directions different in the outer circumference of a writing shaft. CONSTITUTION:An X-axis direction distortion gauge 50x is fixed by adhesion to the outer faces of a pair of plate springs 52 and 52 positioned at the right and left sides of a writing shaft 46 when a writing tool is held obliquely so that a clip part is set at the upper side. While a Y-axis direction distortion gauge 50y is fixed by adhesion to the outer faces of a pair of plate springs 52 and 53 at the other side. Both gauges 50x and 50y contain a silicon semiconductor film 54 coated on the outer face of a flexible substrate 53 adhered to the springs 52 and 52. Then the circumferential displacement of the shaft 46 which is caused by the writing actions with a tip (writing chip 46a) of the shaft 46 having contact with the form surface is detected at a writing type input part by means of both gauges 50x and 50y via spring 52 and 52.

Description

[Detailed description of the invention] [Technical field of invention] The present invention relates to a written data input device.

[Technical background of the invention and its problems]

A writing-type data input device uses a sensor to detect the displacement of the writing shaft associated with writing movements, identifies the writing character shape (numbers, symbols, etc.) based on the output of this sensor, and inputs the data to the information processing unit. Conventionally, this writing-type data input device is provided with a writing shaft inside a pen-shaped case, the tip of which is displaced in a direction opposite to the writing direction as a writing operation is performed, with the tip of the shaft protruding from the tip of the case. Additionally, there is a structure in which a plurality of (generally four or eight) sensors made of piezoelectric elements are arranged in the case so as to surround the outer periphery of the writing shaft.

However, since the conventional writing type data input device described above uses a sensor to directly detect the displacement of the writing shaft, the sensor is sandwiched between the outer peripheral surface of the writing shaft and the inner surface of the case without any gap. Must be incorporated in the state,
For this reason, it is difficult to install the sensor and it is difficult to assemble.Also, since the sensor is in direct contact with the writing shaft, if an impact is applied to the writing shaft, there is a risk that the sensor will be destroyed by this impact. There was also the problem.

[Purpose of the invention]

This invention was made in view of the above-mentioned circumstances, and its purpose is to provide a writing-type data input device in which a sensor can be easily incorporated and there is no need to worry about the sensor being destroyed by impact. There is a particular thing.

[Summary of the invention]

That is, in the present invention, the tips of a plurality of elastic members that are elastically deformable in the radial direction of the writing shaft and whose base ends are cantilevered in the case are brought into contact with the outer periphery of the writing shaft, and at least A sensor is attached to the elastic member in two different directions with respect to the outer periphery of the writing shaft to generate mechanical deformation due to elastic deformation of the elastic member due to displacement of the writing shaft and to convert the amount of mechanical deformation into an amount of electrical change. In this invention, since the elastic member is brought into contact with the writing shaft and the sensor is attached to this elastic member, the sensor cannot be held between the outer peripheral surface of the writing shaft and the inner surface of the case without any gap as in the conventional case. Therefore, it is easy to incorporate the sensor, and since the sensor is not in direct contact with the writing shaft, even if an impact is applied to the writing shaft, the sensor will not be destroyed by this impact. do not have.

[Embodiments of the invention]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings, taking a handwritten input type small electronic calculator as an example.

The writing input type small electronic divider of this embodiment has a length of 1
It is a pen-shaped device measuring 50 to 200 mm, with the central part to the proximal end serving as the computer main body, and the distal end serving as a writing input part.

To explain the configuration of this handwritten input type small electronic calculator,
In FIGS. 1 to 4, 10 is a case of a small handwritten electronic calculator, and this case 10 includes a case 10a of the main body of the calculator (hereinafter referred to as the main body case) and a case 10a of the handwritten input part. Case (hereinafter referred to as input section case) 10b
It consists of The main body case 10a and the input case 10b are both cylindrical, with the main body case 10a having a diameter of 12 to 15 mm, and the input case 10b having a diameter of 10 to 12111111 mm.

The main body case 10a is made by covering the outer periphery of a synthetic resin shaft cylinder 11 with a metal outer cylinder 12 except for its tip, and one side of the shaft cylinder 11 has a horizontally long opening along the case axis direction. 11a, and the metal outer cylinder 12 is provided with an opening 12a that corresponds to the opening 11a of the shaft cylinder 11 and whose length and width are slightly smaller than the opening 11a.

13 is a flat display panel fitted into the opening 11a of the shaft tube 11, and the periphery of the display panel 13 is as follows:
The peripheral edge of the opening 12a of the metal outer cylinder 12 is covered.

A display window 14 fitted with a transparent plate 14a is provided at one end of the display panel 13, and a skip (SK) key 15, a sub sea fence (SB) key 16, A clear (C) key 11 is arranged in one line.

Further, a liquid crystal display element 18 is arranged inside the shaft cylinder 11 so as to face the display window 14.
A wiring board 19 having a length extending substantially over the entire length of the display panel 13 is provided behind the display panel 8 .

This wiring board 19 has, on its back side, a written character shape recognition circuit that recognizes written character shapes (numbers, symbols, etc.) based on input from a writing type input section, and performs calculation processing based on input data from this recognition circuit. The LSI chip 20 on which information processing circuits, display drive circuits, etc. are formed, and other circuit parts (
(not shown), and this wiring board 19 is fixed to a board support portion 21.21 formed inside the shaft cylinder 11 with screws or the like.

In FIGS. 1 and 4, reference numeral 22 denotes an ink connector 23 for connecting each terminal of the liquid crystal display element 18 to liquid crystal display element connection terminals (not shown) arranged on the surface of the wiring board 19. is a spacer interposed between the back surface of the liquid crystal display element 18 and the wiring board 19, and the liquid crystal display element 18 is connected to the wiring board 19 and the transparent plate 14a of the display window 14 via the ink connector 22 and the spacer 23. is sandwiched between.

Further, in FIG. 1, reference numerals 24 and 24 are fixed contacts formed on the surface of the wiring board 19 in correspondence with the respective keys 15, 16, and 17, and 25 is a fixed contact formed on the fixed contact forming portion of the wiring board 19. This is a rubber sheet made of rubber. This rubber sheet 25 has bulges that contact the back surfaces of the keys 15, 16, and 17 at portions corresponding to the fixed contacts 24.24, and the inner surface of each bulge has a key 15.16
．． The fixed contact 2 is deformed by the deformation of the bulge due to the pressing operation of 17.
A movable contact 26.26 is provided which is contacted by 4.24, and this movable contact 26.26 and said fixed contact 24.2
4 form a key switch that is turned on by pressing the keys IS, 16 and 17.

Further, a mode changeover switch 27 that also serves as a power switch is provided in the base end of the shaft cylinder 11. This mode changeover switch 27 is a rotary switch that is changed over by rotating a knob 27a, and the mode changeover switch 27 is connected to the wiring board 19 by a lead wire 28.
is connected to.

Reference numeral 29 denotes a removable cap screwed onto the base end of the shaft cylinder 11, and the mode changeover switch 27 is operated by removing this cap 29. A sound emitting hole 30.30 is opened in the end face of this cap 29, and a piezoelectric buzzer 31 is provided inside this cap 29. This piezoelectric buzzer 31 is driven by a sound signal from the LSI chip 20 every time the writing character shape identification circuit of the LSI chip 20 identifies a writing character shape for one character based on an input signal from the writing type input section. The piezoelectric buzzer 31 is attached within the cap 29 by bonding a diaphragm 31a, which also serves as an outer electrode, to the inner surface of the end surface of the cap 29. 32a and 32b are piezoelectric buzzer connection spring terminals provided at the base end of the shaft tube 11; one of the spring terminals 32a is in contact with the inner electrode surface of the piezoelectric buzzer 31, and the other spring terminal 32b is It is in contact with the imaging plate 31a of the piezoelectric buzzer 31. Note that each spring terminal 32a, 32b is connected to the wiring board 19 by a lead wire 33.

Furthermore, a battery storage section 34 is formed at the tip of the shaft tube 11 that is not covered with the metal outer tube 12, and is open to the side surface thereof. Small size batteries 35.35 are stacked in series and stored. This battery 35.35 is held between a negative battery contact spring 36 made of a coil spring and a positive battery contact spring 37 made of a plate spring.
The other end of 6 is fixed to the wiring board 19.
Connected to the negative battery connection terminal on the front side.

On the other hand, the positive electrode side battery contact TS 31 is connected to the battery storage section 3.
It is removably installed inside 4. This positive electrode side battery contact spring 37 is integrally formed with an extending piece 37a that extends to the open part of the battery storage section 34. The lead wire 38 is connected to the positive battery connection terminal on the wiring board 19 surface.

Reference numeral 39 denotes a cushioning material that presses down the battery 35.35, and this cushioning material 39 is integrated with the positive battery contact spring 37 by inserting the extension piece 31 of the positive battery contact spring 31 therethrough. .

Further, reference numeral 40 denotes a metal battery cover that covers the open part of the battery storage section 34, and this battery cover 40 has a cylindrical shape that covers the entire circumference of the tip of the shaft tube 11. The battery cover 40 is slidably and rotatably fitted onto the outer periphery of the barrel 11, and is screwed into a threaded portion formed on the outer periphery of the barrel 11 at its base end.

When replacing the batteries 35 and 35, the battery cover 40 is rotated to unscrew from the shaft tube 11, and then slid toward the writing input section as shown by the chain line in FIG. To replace the batteries 35 and 35, open the battery compartment 34 by sliding the battery cover 40 toward the writing input section, and remove the positive battery contact spring 37 together with the cushioning material 39. This is done by removing the battery 35.35 from inside the battery storage part 34 and storing a new battery 35.35, then attaching the cushioning material 39 and the positive battery contact spring 37 again and returning the battery cover 40 to its original position. It has become.

In addition, in FIG. 2, 41 indicates the main body case 10a.
This clip 41 is provided on the outer side of the proximal end of the main body case 10a, and this clip 41 is provided at a position shifted approximately 90 degrees from the position of the display panel 13 in the circumferential direction of the main body case 10a.

Next, to explain the configuration of the writing type input section, the case 10b of this writing type input section includes a base end shaft tube 42 made of synthetic resin and a base end side barrel 42 made of synthetic resin. Side shaft cylinder 4
It consists of a metal outer cylinder 43 whose base end side is fitted to the outer periphery of the metal outer cylinder 43, and a tapered base member 44 which is fitted to the distal end of the metal outer cylinder 43 and tapers toward the distal end. Inside the metal outer cylinder 43, there is a distal end thereof and a proximal shaft cylinder 42.
An insulating cylinder 45 made of synthetic resin is fitted and fixed except for the part that fits into the insulating cylinder 45.

The proximal shaft tube 42 and the base member 44 each have a writing shaft insertion hole 42a having a diameter slightly larger than the writing shaft 46 at the center thereof.
, 44a are covered with a membrane, and the writing shaft 46 has a proximal end protruding from the proximal end of the proximal barrel 42 and a distal end protruding from the tip of the base member 44. 42 and the writing shaft insertion holes 42a and 44a of the cap member 44.

This writing shaft 46 is similar to a ballpoint pen refill (center core of a ballpoint pen) in which a writing tip 46a having a writing ball is attached to the tip of the ink cylinder.In this embodiment, the ink cylinder is made of metal as the writing shaft 46. We are using the following.

47 is a spherical body having a ventilation hole that is fitted and fixed to the base end of the writing shaft 45; 48 is a cylindrical spherical receiver screwed to the base end surface of the base end side barrel 42; It is pressed against the innermost part of the spherical receiver 48 by a coil spring 49 and is rotatably held within the spherical receiver 48 .

This ball receiver 48 connects the base end of the writing shaft 46 to the ball 47.
The writing shaft 46 is supported by a spherical support 4 so that it can tilt in any direction using its base end as a fulcrum.
The writing shaft 46 is supported by the base member 44 when the writing shaft 46 is pressed with the writing tip 46a at the tip against the paper surface to write numbers, symbols, etc. on the paper surface. It is adapted to be displaced in the direction opposite to the writing direction by the clearance with the hole 44a.

Further, the spherical receiver 48 is made of a plate spring, and a silicon semiconductor is used on the outer surface thereof as a sensor that detects when a force is applied in the axial direction (Z-axis direction) to the writing shaft 46. A strain gauge 50z is fixed with adhesive. This strain gauge 5oz causes mechanical deformation due to the deformation of the spherical receiver 48 which elastically deforms in the axial direction due to the force applied in the axial direction of the writing shaft 46 when the tip (writing tip 45a) of the writing shaft 46 is pressed against the paper surface. It converts the amount of mechanical deformation of the lever into an amount of electrical change, and when this strain gage 50z generates tensile strain, its resistance value increases. This strain gauge 5oz in the Z-axis direction is connected to the wiring board 19 of the computer main body by a lead wire 51.

Furthermore, within the input unit case 10b, four horizontally long leaf springs 52, 52 along the length direction of the writing shaft are installed in a space between the base end shaft cylinder 42 and the base member 44 to support the writing shaft 46. These leaf springs 52.
52 is a handwritten input type small electronic calculator with its clip 4.
The leaf springs 52, 52 are arranged so that they are on the top, bottom, left and right of the writing shaft 46 when the writing shaft 46 is held diagonally with the writing shaft 46 facing upward.

Each of the leaf springs 52, 52 is cantilevered inside the input case 10b by screwing its base end to the outer periphery of a rectangular cylindrical protrusion 42b protruding from the tip of the proximal shaft cylinder 42. The writing shaft 46 is fixed, and is elastically deformed in the radial direction of the writing shaft 46 at a portion on the distal end side from this fixed portion. Also,
The tip of each of the leaf springs 52, 52 is bent toward the writing shaft 46 as shown in FIG. The writing shaft 46 is in a neutral state, that is, when the writing shaft 46 is in the proximal shaft tube 42 and the writing shaft insertion hole 42a of the base member 44,
It is held at the center of 44a.

This leaf spring 52.52 is made of stainless steel and has a thickness of 0.5IllIl, a width of about 4mm, and a length of the bent part of about 1Qim.
When a writing pressure of I kg (pressure to displace the writing shaft 46 in the direction opposite to the writing direction) is applied to the leaf spring 6, the tip of the leaf spring is approximately 0.
．． It has a spring force that allows it to be displaced by 4mm. Note that there are individual differences in writing pressure, but this writing pressure is approximately 0.5 to 1.5 Kf.
(usually about 0.7Ky), so the leaf spring is 52.5Ky.
If the spring force of No. 2 is selected to the above value, even if there are individual differences in writing pressure, the leaf springs 52 and 52 can be sufficiently deflected and deformed by the writing pressure. However, if the writing pressure exceeds 1.5 kg, the amount of deflection of the leaf spring 52° 52 will become too large and the leaf spring will become fatigued due to repeated deflection and deformation.
In this embodiment, when the amount of deflection of the leaf spring 52.52 exceeds a certain level, the leaf spring 52.52
The cap member 4 is configured to prevent further deformation when it hits the
Select the diameter of the writing shaft insertion hole 44a in No. 4, and insert the leaf spring 52.5.
2 durability is guaranteed.

50x, 50x are the pair of leaf springs 52, 52 located on the left and right sides of the writing shaft 46 when the handwriting input type small electronic calculator is held diagonally with the clip 41 facing upward. The strain gauge in the X-axis direction, 50V, is adhesively fixed to the outer surface of the leaf spring 52.52, and 50y is the Y strain gauge, which is adhesively fixed to the outer surface of the other pair of leaf springs 52.52.
The strain gauges 50x and 50y, which are axial strain gauges in the X-axis direction and Y-axis direction, are provided as sensors for detecting the displacement of the writing shaft 46 accompanying the writing operation.

The strain gauges 50x and 50y are made of silicon semiconductor similar to the strain gauge 502 in the Z-axis direction, and as shown in FIG. It has a structure in which a silicon semiconductor film 54 is deposited on the outer surface.

These strain gauges 50x, 50y generate mechanical deformation due to the deflection deformation of the leaf springs 52, 52 due to the displacement of the writing shaft 46, and convert the amount of mechanical deformation into an amount of electrical change. 50y also has the characteristics shown in FIG. 7, in which its electrical resistance value increases with tensile strain, and its resistance value decreases with compressive strain. Each strain gauge is 5oz.

50y is connected to the wiring board 19 of the computer main body by lead wires 55 and 55, as shown in FIG. Note that the lead wires 55 and 55 are connected to the base end side barrel 42.
The lead wires are guided into the main body case 10a through a lead wire insertion hole (not shown) that is covered with a thin film.

Further, the base of the base member 44 extends from the distal end of the metal outer cylinder 43 to the distal end of the insulating inner cylinder 45 and is fitted inside thereof so as to be slidable in the circumferential direction and the axial direction. The portion of the member 44 that fits into the insulating inner cylinder 45 includes:
As shown in FIG. 6, an inclined groove 51 is formed to slidably engage with a protrusion 56 (see FIG. 1) protruding from a part of the inner side of the tip edge of the insulating inner cylinder 45. As shown in FIG.

By rotating this base member 44, the base member 44 is moved in the axial direction by the guiding action of the inclined groove 57, and when the small electronic calculator of writing input type is used, the base member 44 is moved from its tip to the writing tip at the tip of the writing shaft 46. 46a is moved to the state where it protrudes, and when the writing input type small electronic calculator is not used, it is moved to the tip side as shown by the chain line in FIG.
It is designed to protect the writing tip 46a at the tip of 6.

The above writing input section includes strain gauges 50x and 50y.
, connect the base end of the attached leaf spring 52, 52 to the base end shaft cylinder 42.
At the same time, a writing shaft 46 is inserted into the proximal barrel 42 and a spherical receiver 4 is fixed to the proximal end of the proximal barrel 42.
8, the insulating inner cylinder 45 is fitted and fixed in advance, and the metal outer cylinder 4 is fitted with the base member 44 at the tip.
3 into the base member 44 and the writing shaft 46 into the proximal end shaft barrel 4.
2, and this metal outer cylinder 43 is assembled by caulking to the proximal shaft cylinder 42 with its base end protruding from the base end of the proximal shaft cylinder 42. This writing type input section has a base end portion of the metal outer cylinder 43,
It is integrated with the computer main body by fitting into the tip of the shaft cylinder 11 of the main body case 10a and caulking to this shaft cylinder 11.

The writing type input unit uses a strain gauge 50x to measure the circumferential displacement of the writing shaft 46 due to a writing operation performed by bringing the tip of the writing shaft 46 into contact with a paper surface (writing tip 46a) via plate springs 52, 52. , detected at 50y,
A handwritten data input device is constituted by this handwritten input section and a handwritten character recognition circuit formed in the LSI 20 of the computer main body.

To explain the operation of the writing input section, FIGS. 8 to 10 show the movement of the leaf springs 52 and 52 to which the Y-axis direction strain gauges soy and soy are attached, and when an external force acts on the writing shaft 46. In the state shown in FIG. 8 in which the plate springs 52 and 52 are not deformed either inwardly (toward the writing shaft 46 side) or outwardly, they maintain the initial posture of pressing the writing shaft 46 with a constant spring force. In this state, both leaf springs 52 and 52
Y-axis strain gauge 501/ installed on
Since the amount of mechanical deformation of the strain gauges 501/ and soy is the same, the resistance value Ry1. Ry2
are equal to each other.

On the other hand, as shown in FIG. 9, when the tip of the writing shaft 46 is displaced downward, the lower leaf spring 52 is pushed by the writing shaft 46 and deflects outward, and the upper leaf spring 52 It follows the displacement of the writing shaft 46 and is deflected and deformed inward. Therefore, at this time, the strain gauge 50y attached to the outer surface of the upper leaf spring 52 generates tensile strain and its resistance value Ryl increases, and the strain gauge 50y attached to the outer surface of the lower leaf spring 52 50y causes compressive strain and its resistance value Ry2 decreases.

Furthermore, when the tip of the writing shaft 46 is displaced upward as shown in FIG. It bends and deforms inward following the displacement of the writing shaft 46.

Therefore, at this time, the strain gauge 50y attached to the outer surface of the upper leaf spring 52 generates compressive strain and its resistance value Ry1 decreases, and the strain gauge 50y attached to the outer surface of the lower leaf spring 52 50V causes tensile strain and its resistance value Ry2 increases.

In this case, the writing shaft 46 is a strain gauge 50x in the X-axis direction.

The same is true when the leaf spring 52 to which 50× is attached is displaced in the direction of flexing and deforming. 50x produces compressive strain and its resistance value decreases, and the strain gauge 50x attached to the leaf spring 52, which bends and deforms inward following the displacement of the writing shaft 46, produces tensile strain and its resistance value increases. do.

Next, to explain the written character shape recognition circuit, FIG. 11 shows the circuit of the handwritten input type small electronic calculator, and the written character shape recognition circuit includes a data memory section 60, a registered standard pattern section 61, It consists of a recognition calculation section 62.

Further, the pair of X-axis direction strain gauges 50x.

50x and Y-axis direction strain gauges 50y, 50y are:
The strain gauges 50x, 50x and 50y, 50y are connected in series with an X-axis signal output amplifier 63x and a Y-axis signal output amplifier 63V, respectively. 50y is connected to the low potential VDD (-3■) side, and the other strain gauges 50x l and 50y
is connected to the high potential Vss (OV) side. The Z-axis strain gauge 50z is connected in series with a fixed resistor 64, and a Z-axis signal output amplifier 63Z is connected to the connection point thereof, and the strain gauge 50Z is connected to a low potential VDD (-3V). The fixed resistor 64 is connected to the high potential Vss (OV) side.

The outputs of the amplifiers 63x, 63y, and 63z are connected to A/D:I inverters 65x, 65. y
, 65z to the data memory section 60.

To explain the operation of this handwritten character recognition circuit, when using a handwriting input type small electronic calculator, this circuit is activated by switching the power switch/mode selector switch 27 to the computer mode and turning on the computer power supply circuit 66. becomes.

Then, hold the handwriting input type small electronic calculator in the normal writing state, that is, in the tilted state as shown in FIG. When attached, the spherical receiver 48 is stretched and deformed due to the axial pressure applied to the writing shaft 46, and as a result, the Z-axis direction strain gauge 5oz generates tensile strain and its resistance value RZ increases.

When the resistance value RZ of the Z-axis direction strain gauge 5QZ increases in this way, the divided voltage between this strain gauge 502 and the fixed resistor 64 changes, and the Z-axis signal output amplifier 63Z moves toward the high potential Vss side. Voltage is output. The output of this amplifier 63z (hereinafter referred to as Z-axis output) is converted into a digital small signal by an A/D converter 65Z and input to the data memory section 60. Both are input from this data memory section 60 to the CPU (central information processing unit) 67, and when this Z-axis output is input to CP[J67, CP tJ 67 is connected to its reset terminal R.
A reset signal is given to the timer 68 from the timer 68 to reset the timer 68.

Further, the data memory section 60 outputs the X-axis signal output amplifier 63 only when the Z export power is input thereto.
It accepts the output of the x- and Y-axis signal output amplifier 63V, so when there is no writing pressure in the axial direction of the writing shaft 46 (when the tip of the writing shaft is not pressed against the paper surface), Axis signal output amplifier 63x and Y
The output of the axis signal output amplifier 63V is not input to the data memory section 60.

Now, if you hold the handwriting input type small electronic calculator diagonally as shown in FIG. 12 and press the tip of the writing shaft 46 against the paper surface P, the writing shaft 46 will be displaced upward. The Y-axis direction strain gauge 50y attached to the upper leaf spring 52 of 46 generates compressive strain, and its resistance value R
yl decreases and Y attached to the lower leaf spring 52
The axial strain gauge 50y generates tensile strain and its resistance value Ry2 increases. Therefore, in this state, the output of the Y-axis signal output amplifier 63V is closer to the low potential VDf), so the output of the Y-axis signal output amplifier 63V (hereinafter referred to as Y-axis output) is ) Y#111I
! ■It will be at the level of 1 point.

If you write down the number "1" in this state, the number "1" is usually written in a diagonal line from the upper right to the lower left as shown in Figure 13(a). At this time, the writing shaft 46 is further displaced diagonally upward and to the right from the above-mentioned initial state.

Therefore, when writing the number "1", the Y-axis direction strain gauge 50y attached to the upper leaf spring 52 of the writing shaft 46 further generates compressive strain, its resistance value Ry1 decreases, and the lower The Y-axis direction strain gauge 50y attached to the leaf spring 52 further generates tensile strain and its resistance value Ry2 increases, which causes the output of the Y-axis signal output amplifier 63V to further shift to the low potential VDD side. Therefore, the Y-axis output of this Y-axis signal output amplifier 63V has a waveform as shown in the Y-axis column of FIG. 13(a).

Furthermore, when the number "1" is input by hand, the writing shaft 46 is displaced obliquely to the upper right as described above, so that the X-axis direction strain gauge 50x attached to the leaf spring 52 on the right side of the writing shaft 46 is Compressive strain is generated and its resistance value Rx1 decreases, and the X-axis direction strain gauge 50x attached to the left leaf spring 52 generates a tensile strain and its resistance value Rx1 decreases.
x2 will increase. Therefore, the output of the X-axis signal output amplifier 63x also approaches the low potential VDD side, but the X-axis direction strain gauge 50x when writing the number "1"
, 50x resistance value RX1. Since the change in RX2 is small, the output of this X-axis signal output amplifier 63x (hereinafter referred to as X-axis output) has a waveform as shown in the X-axis column of FIG. 13(a).

Next, when the subtraction symbol "-" is input by hand, the writing axis 46 is displaced to the left because the subtraction symbol "-" is written almost horizontally from left to right.

Therefore, when writing the subtraction symbol "-", the X-axis direction strain gauge 50x attached to the leaf spring 52 on the right side of the writing shaft 46 generates a large tensile strain, and its resistance value R
x1 increases, and X attached to the left leaf spring 52
Since the axial strain gauge 50x produces a large compressive strain and its resistance value Rx2 decreases, the X-axis output of the X-axis signal output amplifier 63x has a waveform as shown in the X-axis column of FIG. 13(b).

Also, when writing the subtraction symbol "-", writing pressure is applied to upwardly displace the writing shaft 46, which is pressed diagonally to the paper surface P. During input, the Y-axis strain gauges soy and so
y is distorted, and the Y-axis output waveform of the Y-axis signal output amplifier 63V becomes the waveform shown in the Y-axis column of FIG. 13(b).

The X-axis output of the X-axis signal output amplifier 63X and the Y-axis output of the Y-axis signal output amplifier 63y are converted into digital signals by A/D converters 65x and 65y, respectively, and input to the data memory section 60. The data is input from the data memory section 60 to the recognition calculation section 62 .

The registered standard pattern section 61 also includes the X-axis output and the Y-axis output.
Standard glyph patterns such as numbers and operation symbols that correspond to combinations with shaft outputs are registered, and the recognition calculation section 62 uses the input data from the data memory section 60 and the standard glyph patterns from the registered standard pattern section 61. The glyph pattern with the highest correlation is selected by comparison, and its glyph pattern number is input to the CPU 67.

Also, when you finish writing one number or symbol, the writing axis 4
When the tip of 6 is separated from the paper surface, the Z-axis direction strain gauge 50z returns from the tensile strain state to the reference potential, so that the Z-export force from the Z-axis signal output amplifier 632 disappears. By stopping this Z-axis output, CP tJ 67
A start signal is sent from the set terminal S to the timer 68, and the timer 68 starts counting clock pulses φ.

Then, when the timer 68 reaches the preset number of clock pulses, the timer 68 clocks the CPU 67.
A carry signal is sent to the terminal, and based on this the CPU
67 outputs a timing pulse from its B terminal to the piezoelectric buzzer 31 to drive the piezoelectric buzzer 31 to sound.

The set time of the timer 68 is set to be sufficiently longer than the pause time during the writing operation when writing numbers, symbols, etc. that are written in multiple writing operations.

That is, for example, the number "5" is written in two writing operations: 11 bIT and um.
If the timer 68 is set as described above,
The piezoelectric buzzer 31 does not sound for a short period of time after writing ``b'' until the beginning of writing ``-'', but starts sounding an appropriate time after ``5'' is completely written. .

In other words, this piezoelectric buzzer 31 notifies the end of the input each time one number, symbol, etc. is input by hand, and waits until the piezoelectric buzzer 31 notifies the end of the input to proceed with the next number, symbol, etc. By inputting , numbers and symbols, etc. written in one writing motion, as well as numbers and symbols, etc. written in multiple writing motions, can be entered as input information for one character without causing confusion. be able to.

On the other hand, the CP Ll 67 is configured to send numerical information and calculation command information to the calculation memory section 69 based on the glyph pattern number input from the recognition calculation section 62, and The information is sent to the display section 70 and displayed on the liquid crystal display element 18.

Further, the calculation memory unit 69 stores numerical information from the CPU 67 and executes calculations between the calculation number and the operand according to the calculation command information, and the calculation results are displayed on the display unit 70.
is sent to and displayed.

Next, the functions of the skip (SK) key 15, subsiefence (SB) key 16, and clear (C) key 17 provided on the outer surface of the computer main body will be explained.

The skip key 15 is operated when registering a standard glyph pattern in the registered standard pattern section 61. When the skip key 15 is pressed with the power switch/mode changeover switch 27 switched to the standard glyph pattern registration mode, the skip key 15 is pressed. , 0.1 is displayed on the display every time the skip key 15 is pressed once.
．． 2. -g, +, -, x.

Numerals such as ÷, -1, etc., arithmetic symbols, etc. are sequentially displayed.

For example, when the number "1" is written down with "1" displayed on the display section, the X-axis output and Y-axis output of the X-axis signal output amplifier 53x and the Y-axis signal output amplifier 53V are output from the data memory section 60. The combination of the X-axis output and the Y-axis output at this time is then registered as a standard character pattern of the number "1" when the skip key 15 is pressed.

Therefore, by pressing the skip key 15 and writing down the numbers and symbols while sequentially displaying them, the handwriting shape that matches the user's habits can be registered as a standard character shape pattern in the registered standard pattern section 61. I can do it.

The sub-sequence key 16 is pressed when a written character is misrecognized and a different number or symbol is displayed on the display. When this sub-sequence key 16 is pressed,
The recognition calculation unit 62 selects a glyph pattern with the next highest correlation to the glyph pattern selected first. Each time the sub-sequence key 16 is pressed, the selection of the jin-shaped pattern is carried out in descending order of correlation, and in conjunction with this, the glyph pattern number input from the recognition calculation unit 62 to the CP IJ 67 is input again.

Therefore, the written character form is misrecognized and incorrect input information becomes CP.
Even if the information is input to the calculation memory section 69 from the tJ 67, if the subsequence key 16 is pressed until the same numbers or symbols as those input by hand are displayed on the display section, the input information to the calculation memory section 69 can be inputted to the calculation memory section 69. can be corrected.

In addition, the clear key 17 is used when clearing the previous calculation result,
This is pressed to clear the input when you have written down a number or symbol by mistake.If you have written down a number or symbol by mistake, you can press this clear key 11 and then re-enter the number or symbol. .

In addition, when a written character shape is misrecognized as described above and a different number or symbol is displayed on the display, the misrecognition can be corrected by canceling the input using the clear key 11 and inputting it again in writing. I often make mistakes in writing glyphs! l! The user can decide whether to correct the information by operating the sub-sequence key 16 or by canceling the input using the clear key 17 and re-entering it.

That is, this handwritten input type small electronic calculator identifies written numbers, operation symbols, etc. by the displacement of the writing shaft 46,
The data is input to the information processing unit and calculations are performed. When numbers, calculation symbols, etc. are written down on a piece of paper, the calculations are automatically performed and the calculation results are displayed.

Therefore, in this handwriting input type small electronic calculator, the writing input section is fixed to the outer periphery of the writing shaft 46 with the base end cantilevered inside the input section case 10b, and is elastically deformed in the radial direction of the writing shaft. The tips of a plurality of possible leaf springs 52.52 are brought into contact with each other, and mechanical deformation is caused in the leaf springs 52.52 by elastic deformation of the leaf springs 52.52 due to the displacement of the writing shaft 46, and the amount of mechanical deformation is Since the structure is equipped with sensors (strain gauges 50x, 50y) that convert the amount of change into electrical changes, there is no need to sandwich the sensor between the outer circumferential surface of the writing shaft and the inner surface of the case, as in the conventional case, without leaving a gap.
Therefore, it is easy to incorporate the sensor, and since the sensor is not in direct contact with the writing shaft 46, even if an impact is applied to the writing shaft 46, the sensor will not be destroyed by this impact.

In the above embodiment, all of the leaf springs 52 and 52 are brought into elastic contact with the writing shaft 46 in four directions surrounding the writing shaft 46, so that even when the writing shaft 46 is displaced in the direction away from the leaf spring 52, the leaf springs 52 deforms toward the writing shaft side following the displacement of the writing shaft 46, but this leaf spring 52゜52 is kept lightly in contact with the writing shaft 46, and only when pushed by the writing shaft 46 does it deform. It may also be elastically deformed outward.

Further, in the above embodiment, the leaf springs 52, 52 are provided in four directions surrounding the writing shaft 46, but the leaf springs may be provided in three, six, or eight directions, and the sensor is It is not necessarily necessary to attach it to all the leaf springs, as long as it is attached to the leaf springs in two different directions with respect to the outer periphery of the writing shaft 46 at least.

That is, in FIG. 14, there are three
By arranging the leaf springs 52 and 52, these three leaf springs 5
2.52 shows an example in which the writing shaft 46 is held in a neutral position and a strain gauge 50°50 is attached to the outer surface of only two of the three leaf springs 52.52. with at least a strain gauge of 50.
The two leaf springs 52 and 52 to which 50 are attached are attached to the writing shaft 46.
Even when the writing shaft 46 is displaced in the direction away from the leaf spring 52 by coming into elastic contact with the writing shaft 46, the writing shaft 46 deforms inward (to the writing shaft side) following the displacement of the writing shaft 46.

That is, in this embodiment, the displacement of the writing shaft 46 in the circumferential direction is detected using only two strain gauges 50.50.
When the leaf spring 52 is pushed by the writing shaft 46 and deforms outward, compressive strain is generated and the resistance value decreases, and conversely, when the leaf spring 52 is deformed inward, tensile strain is generated and the resistance value increases. If the direction of displacement of the writing shaft 46 is determined from the resistance change of the two strain gauges 50.50, displacement of the writing shaft 46 in any direction can be detected using only the two strain gauges 50.50.

This also applies when leaf springs are arranged in four, six, or eight directions surrounding the writing shaft; in that case, one of the pairs of leaf springs facing each other across the writing shaft must be Simply attach a strain gauge to the

Further, in the above embodiment, the strain gauges 50x, 50y for detecting the displacement of the writing shaft 46 are attached to the outer surface of the leaf spring 52,52.
50y may be attached to the inner surface of the leaf spring 52.52. Furthermore, the strain gauges 50x, 50y, and 50z are not limited to those using silicon semiconductors, but may also be ones using metal foil, and piezoelectric elements may be used as sensors instead of the strain gauges. However, when a piezoelectric element is used as a sensor, since the amount of electrical change is detected as a change in the amount of charge, it is necessary to provide a conversion circuit that converts the change in the amount of charge into the amount of voltage change.

Further, in the above embodiment, a leaf spring is used as the elastic member for attaching the sensor, but this elastic member may be made of an elastic resin plate such as polycarbonate, and the writing shaft may be made of something like a ballpoint pen refill. However, it is also possible to use a simple shaft rod.

In the above embodiment, the Z-axis strain gauge 5 detects when axial writing pressure is applied to the writing shaft 46.
oz, but this Z-axis strain gauge 5oz
It doesn't have to be there.

Furthermore, in the above embodiment, the writing shaft 46 is supported at its base end so that the distal end side can be displaced in the direction opposite to the writing direction, but if the writing shaft 46 is made flexible, the base end of the writing shaft may be fixed inside the case.

Although the above embodiment has been explained by taking as an example a writing data input device incorporated into a small handwriting input type electronic calculator, the present invention is also applicable to a writing data input device that is connected to a personal computer and is equipped with only a writing input section. The present invention can also be applied to a writing type data input device for inputting data to a computer.

〔Effect of the invention〕

In the present invention, tips of a plurality of elastic members that are elastically deformable in the radial direction of the writing shaft and whose base ends are cantilevered in the case are brought into contact with the outer periphery of the writing shaft. A sensor is attached to an elastic member extending in two different directions with respect to the outer periphery of the shaft, which generates mechanical deformation due to elastic deformation of the elastic member due to displacement of the writing shaft, and converts the amount of mechanical deformation into an amount of electrical change. Therefore, there is no need to sandwich the sensor between the outer circumferential surface of the writing shaft and the inner surface of the case as in the past (therefore, it is easy to incorporate the sensor, and the sensor cannot be directly attached to the writing shaft). Since there is no contact, even if an impact is applied to the writing shaft, this impact will not destroy the sensor.

[Brief explanation of drawings]

Figures 1 to 13 show an embodiment of the present invention. Figure 1 is an enlarged cross-sectional view taken along line A-A in Figure 2, and Figure 2 is an illustration of a handwritten input type small electronic calculator. Exterior perspective views, Figures 3 and 4 are taken from BB in Figure 1! FIG. 5 is an enlarged perspective view of the leaf spring arranged around the writing shaft, FIG. 6 is an enlarged perspective view of the cap member at the tip of the case, and FIG. Resistance change characteristic diagram, Figures 8 to 10 are illustrations of the deformation behavior of the leaf spring due to displacement of the writing shaft, Figure 11 is a circuit diagram of a small electronic calculator with writing input,
Figure 12 is a usage diagram of a small electronic calculator with handwritten input.
Fig. 13 is an output waveform diagram when the number "1" and the subtraction symbol "-pa" are input by hand. Fig. 14 is a layout diagram of a leaf spring showing another embodiment of the present invention. 10.・Case, 46...Writing axis, 50x, s
oy, 50...strain gauge, 52... leaf spring. Applicant's agent Patent attorney Takehiko Suzue Figure 2 A 4t5a Figure 3 Figure 4 Figure 6a Figure 6 Figure 8 Figure 9 Figure 10

Claims (1)

[Claims] A writing shaft whose distal end protrudes inside the case and whose distal end side is displaced in a direction opposite to the writing direction as a writing operation is performed; and a writing shaft whose base end is fixed in a cantilevered state inside the case and whose distal end is disposed at the distal end. a plurality of elastic members that are elastically deformable in the radial direction of the writing shaft and in contact with the outer periphery of the writing shaft; and a plurality of elastic members that are attached to the elastic members in at least two different directions with respect to the outer periphery of the writing shaft among the elastic members and elastically deformable by displacement of the writing shaft. A sensor that generates mechanical deformation due to the elastic deformation of a member and converts the amount of mechanical deformation into an amount of electrical change, and a sensor that recognizes the shape of the written character based on the amount of electrical change of this sensor and inputs that data to the information processing unit. A writing type data input device characterized by comprising means for.